visualization 1.2.1 has been released.  This patch release fixes the
following bugs with rxbag:

   - bug fix for displaying images with rgb8 encoding
#4415<https://code.ros.org/trac/ros-pkg/ticket/4415>
   - bug fix for plotting integers
#3028<https://code.ros.org/trac/ros-pkg/ticket/3028>

The full change list is here:
http://www.ros.org/wiki/visualization/ChangeList/1.2.

Tim